var textSize=12;var lineHeight=textSize+5;function up(){if(textSize<=17) textSize+=2;lineHeight=textSize+5;document.getElementById('content').style.fontSize=textSize+'px';document.getElementById('content').style.lineHeight=lineHeight+'px';return false;} function down(){if(textSize>=10) textSize-=2;lineHeight=textSize+5;document.getElementById('content').style.fontSize=textSize+'px';document.getElementById('content').style.lineHeight=lineHeight+'px';return false;}